JP6821119B2 - Projection type display device - Google Patents

Description

The present invention relates to a projection type display device.

When a liquid crystal panel is used as an optical modulation element of a projection type display device, an orientation defect called dispersion may occur. Discrimination is the direction in which when there is a potential difference in the image signals between adjacent pixels in the liquid crystal panel, a transverse electric field is generated between the adjacent pixels and the liquid crystal molecules between the pixels are affected by the transverse electric field. A phenomenon in which the liquid crystal is oriented in a different direction from the above. For example, when the voltage difference of the image signal between pixels is increased in order to increase the brightness difference between adjacent pixels, the transmittance of the pixels fluctuates due to the influence of the lateral electric field, resulting in coloring, tailing, and light leakage. Such a phenomenon that causes deterioration of the image quality of the image projected by the projection optical system may occur.

Patent Document 1 describes a disk that appears in a part of white display pixels adjacent to black display pixels in a plurality of liquid crystal display elements in order to prevent coloring due to a difference in dispersion that occurs in the plurality of liquid crystal display elements. A technique for setting the orientation direction of a liquid crystal display element on which an image is inverted and the orientation direction of another liquid crystal display element so that the relation patterns substantially match each other in an image displayed on a screen via a photosynthesis means. Is disclosed.

Patent Document 2 discloses a technique for defining liquid crystal alignment conditions for obtaining a high-contrast image in a liquid crystal display element including a vertically oriented liquid crystal. According to Patent Document 2, the line segment when the long axis of the liquid crystal molecule is projected vertically on the substrate is 42 [°] or more 48 with respect to the direction of the straight line when the wire grid is projected vertically on the substrate. By making an angle of [°] and setting the liquid crystal orientation condition so that one end of the line segment is located on the crossing side of the surface including the polarization spectroscopic surface and the surface containing the substrate with respect to the other end. , A high-contrast image can be obtained.

Japanese Patent No. 3888344 Japanese Patent No. 4661510

The liquid crystal panel used for the light modulation element is roughly classified into a transmissive liquid crystal panel and a reflective liquid crystal panel. The reflective liquid crystal panel is said to be more advantageous than the transmissive liquid crystal panel in terms of high definition, miniaturization, and high brightness of the projection display device. In a projection type display device using a reflective liquid crystal panel, there is a demand for a technique capable of displaying a high-contrast image by suppressing deterioration of image quality due to dispersion.

An object of the present invention is to provide a projection type display device capable of displaying a high-contrast image by preventing deterioration of image quality due to dispersion.

According to the aspect of the present invention, the illumination optical system that color-separates the light emitted from the light source device to generate a plurality of colored lights and the colored lights are arranged in each of the plurality of colored light paths and based on the image data. Is arranged in each of a plurality of reflective liquid crystal panels for photomodulating the light, and each of the plurality of optical paths of the colored light, is inclined with respect to the optical path of the colored light incident on the reflective liquid crystal panel, and is incident on the reflective liquid crystal panel. A plurality of polarizers that transmit the colored light in the first polarized state and reflect the colored light in the second polarized state from the reflective liquid crystal panel, and light-modulated by the reflective liquid crystal panel and reflected by the polarizer. The reflective liquid crystal panel comprises a synthetic optical system that synthesizes a plurality of the colored lights to generate synthetic light, and a projection optical system that projects the synthetic light generated by the synthetic optical system onto a projection surface. It has a negative dielectric anisotropy, has a liquid crystal layer containing a liquid crystal that is pretilted in a predetermined orientation direction and is oriented, and the synthetic optical system is a first reflective liquid crystal among the plurality of reflective liquid crystal panels. The first incident surface emitted from the panel and incident with the first color light emitted from the composite surface of the synthetic optical system and the second color light emitted from the second reflective liquid crystal panel and transmitted through the composite surface are incident. The polarizer has two incident surfaces, the first polarizer that reflects the first color light from the first reflective liquid crystal panel to the first incident surface, and the second reflective liquid crystal panel. The orientation direction of the liquid crystal of the first reflection type liquid crystal panel and the orientation direction of the liquid crystal of the second reflection type liquid crystal panel, including the second polarizer that reflects the second color light to the second incident surface. A projection type display device is provided which is orthogonal to and.

According to the aspect of the present invention, there is provided a projection type display device capable of displaying a high-contrast image by suppressing deterioration of image quality due to dispersion.

FIG. 1 is a plan view schematically showing an example of a projection type display device according to the present embodiment. FIG. 2 is a perspective view schematically showing an example of a projection type display device according to the present embodiment. FIG. 3 is a diagram schematically showing a part of the projection type display device according to the present embodiment. FIG. 4 is a cross-sectional view showing an example of the reflective liquid crystal panel according to the present embodiment. FIG. 5 is a diagram schematically showing a liquid crystal according to the present embodiment. FIG. 6 is a diagram schematically showing a liquid crystal according to the present embodiment. FIG. 7 is a perspective view schematically showing the relationship between the orientation direction of the liquid crystal of the reflective liquid crystal panel according to the present embodiment, the polarizer, and the synthetic optical system. FIG. 8 is a diagram showing a vector of projection line segments for the liquid crystal alignment condition according to the present embodiment. FIG. 9 is a plan view for explaining the operation of the projection type display device according to the present embodiment. FIG. 10 is a perspective view for explaining the operation of the projection type display device according to the present embodiment. FIG. 11 is a plan view for explaining the operation of the projection type display device according to the present embodiment. FIG. 12 is a plan view for explaining the operation of the projection type display device according to the present embodiment.

An embodiment of the present invention will be described with reference to the drawings, but the present invention is not limited thereto. The components of the embodiments described below can be combined as appropriate. In addition, some components may not be used.

In the following description, the XYZ Cartesian coordinate system, which is a global coordinate system, is set, and the positional relationship of each part will be described with reference to this XYZ Cartesian coordinate system. The direction parallel to the X-axis, which is the first axis in the predetermined plane, is the X-axis direction, and the direction parallel to the Y-axis, which is the second axis orthogonal to the first axis in the predetermined plane, is the Y-axis direction, the first axis, and The direction parallel to the Z-axis, which is the third axis orthogonal to the second axis, is defined as the Z-axis direction. The third axis is orthogonal to the predetermined plane. Further, one direction in the X-axis direction is the + X direction, and the opposite direction in the + X direction is the −X direction. One direction in the Y-axis direction is the + Y direction, and the opposite direction in the + Y direction is the −Y direction. One direction in the Z-axis direction is the + Z direction, and the opposite direction in the + Z direction is the −Z direction. In the present embodiment, the predetermined surface is parallel to the horizontal plane, and the Z-axis direction is the vertical direction. In the following description, the predetermined plane is appropriately referred to as an XY plane.

FIG. 1 is a plan view schematically showing an example of a projection type display device 100 according to the present embodiment. FIG. 2 is a perspective view schematically showing an example of the projection type display device 100 according to the present embodiment. As shown in FIGS. 1 and 2, the projection type display device 100 has a light source device 1 that generates light, a first color separation element 11 and a second color separation element 12, and is emitted from the light source device 1. The illumination optical system 10 that separates the light into colors to generate the first color light Lb, the second color light Lg, and the third color light Lr, and the first color light Lb, the second color light Lg, and the first color light Lg generated by the illumination optical system 10. The first reflective liquid crystal panel 31 and the second reflective liquid crystal are arranged in each of the optical paths of the three-color light Lr and light-modulate each of the first color light Lb, the second color light Lg, and the third color light Lr based on the image data. The first color light Lb and the second color light light-modulated by the panel 32, the third reflective liquid crystal panel 33, the first reflective liquid crystal panel 31, the second reflective liquid crystal panel 32, and the third reflective liquid crystal panel 33. It includes a synthetic optical system 40 that synthesizes Lg and a third color light Lr to generate synthetic light, and a projection optical system 50 that projects the synthetic light generated by the synthetic optical system 40.

The light source device 1 generates white light. In the present embodiment, the light source device 1 emits a solid light source 2 that emits excitation light, a phosphor 3 that generates fluorescence by being irradiated with the excitation light, and a phosphor 3 that emits excitation light emitted from the solid light source 2. It has a half mirror 4 leading to the light, and a condensing optical system 5 for condensing the excitation light applied to the phosphor 3. The solid-state light source 2 includes a laser diode (LD). The solid-state light source 2 emits blue laser light as excitation light. The excitation light emitted from the fixed light source 2 irradiates the phosphor 3 via the half mirror 4 and the condensing optical system 5. When irradiated with the excitation light, the phosphor 3 emits yellow fluorescence. White light is generated based on the excitation light and fluorescence. The white light generated by the light source device 1 is incident on the illumination optical system 10.

The illumination optical system 10 color-separates the light emitted from the light source device 1 to generate a plurality of colored lights Lb, Lg, and Lr. The illumination optical system 10 separates the first color light Lb from the integrator optical system 6 on which the light emitted from the light source device 1 is incident and the light emitted from the integrator optical system 6, and emits the first color light Lb in the −X direction. The color separating element 11 and the light Lgr emitted from the first color separating element 11 are separated into the second color light Lg and the third color light Lr, and the second color light Lg is emitted in the −X direction to emit the third color light Lr. Is emitted from the second color separation element 12 that emits light in the + Y direction, the first reflection member 13 that reflects the first color light Lb emitted from the first color separation element 11 in the + Z direction, and the second color separation element 12. A second reflecting member 14 that reflects the second color light Lg in the + Z direction, a third reflecting member 15 that reflects the third color light Lr emitted from the second color separating element 12 in the + Z direction, and a first color light Lb. It includes a relay optical system 20 that is arranged in an optical path and forms an upright image.

The integrator optical system 6 equalizes the illuminance of the light emitted from the light source device 1. The integrator optical system 6 includes a first lens array 6A, a second lens array 6B, a polarization conversion element 7, and a condenser lens 8. The optical axis of the integrator optical system 6 is parallel to the Y axis. The light emitted from the integrator optical system 6 travels in the + Y direction.

The first lens array 6A has a plurality of microlenses arranged in a matrix in the XZ plane. The second lens array 6B has a plurality of microlenses arranged in a matrix in the XZ plane. The plurality of microlenses of the first lens array 6A and the plurality of microlenses of the second lens array 6B have a one-to-one correspondence. The polarization conversion element 7 has a plurality of polarization conversion units. The polarization conversion unit includes a polarization separation membrane, a reflection mirror, and a phase plate. The plurality of microlenses of the second lens array 6B and the plurality of polarization conversion units of the polarization conversion element 7 have a one-to-one correspondence.

The light emitted from the light source device 1 and incident on the integrator optical system 6 is incident on each of the plurality of microlenses of the first lens array 6A. A part of the light incident on the incident surface of the integrator optical system 6 is incident on each of the plurality of microlenses of the first lens array 6A, depending on the position of the microlenses. Therefore, the light received by each microlens is different. Each microlens of the first lens array 6A collects the light emitted from the light source device 1 on each microlens of the second lens array 6B corresponding to each microlens of the first lens array 6A. A secondary light source image is formed on each of the plurality of microlenses of the second lens array 6B. The second lens array 6B constitutes the optical pupil of the first lens array 6A.

The light from the secondary light source image formed on each microlens of the second lens array 6B is incident on each polarization conversion unit of the polarization conversion element 7 corresponding to the microlens of the second lens array 6B. The light incident on the polarization conversion unit is separated into light in the first polarization state and light in the second polarization state by the polarization separation film. The light in the second polarized state separated by the polarizing separation film is reflected by the reflection mirror and then passed through the phase plate to be converted into the light in the first polarized state. That is, the light emitted from the light source device 1 is converted into the light in the first polarized state by passing through the polarization conversion element 7.

The light emitted from each of the plurality of polarization conversion units is incident on the condenser lens 8. The condenser lens 8 superimposes the light emitted from each of the plurality of polarization conversion units on the light flux of 1. As a result, the illuminance distribution in each of the first reflective liquid crystal panel 31, the second reflective liquid crystal panel 32, and the third reflective liquid crystal panel 33 is made uniform.

The integrator optical system 6 may include a rod integrator.

The first color separating element 11 is arranged on the + Y side of the integrator optical system 6. The first color separating element 11 includes a dichroic mirror. The first color separation element 11 separates the first color light Lb from the light emitted from the light source device 1 and transmitted through the integrator optical system 6. In the present embodiment, the first color separating element 11 separates the white light from the light source device 1 into blue light which is the first color light Lb and light Lgr having a wavelength different from that of the blue light. The first color light Lb, which is blue light, is reflected by the first color separating element 11 and travels in the −X direction. Light Lgr having a wavelength different from that of blue light passes through the first color separating element 11 and travels in the + Y direction.

The second color separating element 12 is arranged on the + Y side of the first color separating element 11. The second color separating element 12 includes a dichroic mirror. The second color separating element 12 separates the light Lgr having a wavelength different from the blue light emitted from the first color separating element 11 into the second color light Lg and the third color light Lr. In the present embodiment, the second color separating element 12 separates the light Lgr emitted from the first color separating element 11 into green light which is the second color light Lg and red light which is the third color light Lr. The second color light Lg, which is green light, is reflected by the second color separating element 12 and travels in the −X direction. The third color light Lr, which is red light, passes through the second color separating element 12 and travels in the + Y direction.

The first reflecting member 13 reflects the first color light Lb from the first color separating element 11 in the + Z direction. In the present embodiment, the illumination optical system 10 has a fourth reflection member 16 arranged between the first color separation element 11 and the first reflection member 13. The fourth reflecting member 16 reflects the first color light Lb from the first color separating element 11 in the + Y direction. The fourth reflecting member 16 is arranged on the −X side of the first color separating element 11. The first color light Lb traveling in the −X direction from the first color separating element 11 is reflected by the reflecting surface 16A of the fourth reflecting member 16 and travels in the + Y direction. The first reflective member 13 is arranged on the + Y side of the fourth reflective member 16. The first color light Lb traveling in the + Y direction from the fourth reflecting member 16 is reflected by the reflecting surface 13A of the first reflecting member 13 and traveling in the + Z direction.

The second reflecting member 14 reflects the second color light Lg from the second color separating element 12 in the + Z direction. The second reflecting member 14 is arranged on the −X side of the second color separating element 12. The second color light Lg traveling in the −X direction from the second color separating element 12 is reflected by the reflecting surface 14A of the second reflecting member 14 and travels in the + Z direction.

The third reflecting member 15 reflects the third color light Lr from the second color separating element 12 in the + Z direction. The third reflecting member 15 is arranged on the + Y side of the second color separating element 12. The third color light Lr traveling in the + Y direction from the second color separating element 12 is reflected by the reflecting surface 15A of the third reflecting member 15 and travels in the + Z direction.

In the present embodiment, the reflecting surface 13A of the first reflecting member 13 and the reflecting surface 15A of the third reflecting member 15 are parallel to each other. The reflecting surface 13A of the first reflecting member 13 is parallel to the X axis and is inclined in the + Z direction toward the + Y direction. Similarly, the reflecting surface 15A of the third reflecting member 15 is parallel to the X axis and is inclined in the + Z direction toward the + Y direction.

In the present embodiment, the reflecting surface 13A of the first reflecting member 13 and the reflecting surface 15A of the third reflecting member 15 are arranged in the same plane. The plane including the reflection surface 13A of the first reflection member 13 and the reflection surface 15A of the third reflection member 15 and the plane including the reflection surface 14A of the second reflection member 14 are orthogonal to each other. In the present embodiment, the reflecting surface 14A of the second reflecting member 14 is parallel to the Y axis and is inclined in the + Z direction toward the −X direction.

The relay optical system 20 is arranged in the optical path of the first color light Lb between the first color separating element 11 and the first reflective liquid crystal panel 31. In the present embodiment, the relay optical system 20 is arranged in the optical path of the first color light Lb between the first color separating element 11 and the first reflecting member 13. The relay optical system 20 forms an erect image of an object on the object surface side of the relay optical system 20 on the image plane side of the relay optical system 20.

The relay optical system 20 is arranged between the first condensing lens 21 arranged between the first color separating element 11 and the fourth reflecting member 16 and between the fourth reflecting member 16 and the first reflecting member 13. It has a second condensing lens 22 and a third condensing lens 23. The first condensing lens 21, the second condensing lens 22, and the third condensing lens 23 are convex lenses, respectively. The third condensing lens 23 is optically conjugated with the second lens array 6B. Since the third condensing lens 23 and the second lens array 6B are optically coupled and the second lens array 6B acts as the pupil of the first lens array 6A, the second lens array 6B and the third condensing lens An image of each microlens of the first lens array 6A is formed between the lens and the lens 23.

In the present embodiment, the relay optical system 20 forms an upright image of an object on the image plane side of the relay optical system 20. For example, when the image X is formed on the object surface side of the relay optical system 20, the relay optical system 20 has an image X between the first color separating element 11 and the first reflective liquid crystal panel 31 which is the image surface. An inverted image of the image X is formed, and an upright image of the image X is formed on the image plane side of the relay optical system 20. In the present embodiment, the image X refers to each of a partial image of the light emitted from the light source device 1 and received by each of the plurality of microlenses of the first lens array 6A.

The first reflective liquid crystal panel 31 is arranged in the optical path of the first color light Lb. The first reflective liquid crystal panel 31 is a light modulation element that photomodulates the first color light Lb from the first reflective member 13 based on image data. The first reflective liquid crystal panel 31 is arranged on the + Z side of the first reflective member 13. The first color light Lb traveling in the + Z direction from the first reflective member 13 is incident on the first reflective liquid crystal panel 31.

The first reflective liquid crystal panel 31 has an incident surface 31A on which the first color light Lb from the first reflective member 13 is incident. The first reflective liquid crystal panel 31 reflects the first color light Lb from the first reflecting member 13 in the −Z direction.

The second reflective liquid crystal panel 32 is arranged in the optical path of the second color light Lg. The second reflective liquid crystal panel 32 is a light modulation element that photomodulates the second color light Lg from the second reflective member 14 based on the image data. The second reflective liquid crystal panel 32 is arranged on the + Z side of the second reflective member 14. The second color light Lg traveling in the + Z direction from the second reflecting member 14 is incident on the second reflecting type liquid crystal panel 32.

The second reflective liquid crystal panel 32 has an incident surface 32A on which the second color light Lg from the second reflective member 14 is incident. The second reflective liquid crystal panel 32 reflects the second color light Lg from the second reflective member 14 in the −Z direction.

The third reflective liquid crystal panel 33 is arranged in the optical path of the third color light Lr. The third reflective liquid crystal panel 33 is a light modulation element that photomodulates the third color light Lr from the third reflective member 15 based on the image data. The third reflective liquid crystal panel 33 is arranged on the + Z side of the third reflective member 15. The third color light Lr traveling in the + Z direction from the third reflective member 15 is incident on the third reflective liquid crystal panel 33.

The third reflective liquid crystal panel 33 has an incident surface 33A on which the third color light Lr from the third reflective member 15 is incident. The third reflective liquid crystal panel 33 reflects the third color light Lr from the third reflective member 15 in the −Z direction.

The incident surface 31A of the first reflective liquid crystal panel 31 is parallel to the XY plane and faces the −Z direction. Similarly, the incident surface 32A of the second reflective liquid crystal panel 32 and the incident surface 33A of the third reflective liquid crystal panel 33 are parallel to the XY plane and face in the −Z direction. In the present embodiment, the incident surface 31A of the first reflective liquid crystal panel 31, the incident surface 32A of the second reflective liquid crystal panel 32, and the incident surface 33A of the third reflective liquid crystal panel 33 face in the same direction. It is arranged in the same plane parallel to the XY plane.

The polarizer 61 and the polarizer 62 are arranged in the optical path of the first color light Lb between the first reflective member 13 and the first reflective liquid crystal panel 31. The polarizer 63 and the polarizer 64 are arranged in the optical path of the second color light Lg between the second reflective member 14 and the second reflective liquid crystal panel 32. The polarizing element 65 and the polarizing element 66 are arranged in the optical path of the third color light Lr between the third reflecting member 15 and the third reflective liquid crystal panel 33.

The polarizer 61 transmits the first color light Lb in the first polarized state reflected by the first reflecting member 13. The first-color light Lb in the first polarized state that has passed through the polarizer 61 passes through the polarizer 62 and is incident on the first reflective liquid crystal panel 31. The first reflective liquid crystal panel 31 photomodulates the first color light Lb transmitted through the polarizer 61 and the polarizer 62 based on the image data. The polarizing element 62 is arranged in the optical path of the first color light Lb between the polarizing element 61 and the first reflective liquid crystal panel 31. The polarizer 62 transmits the first-color light Lb in the first polarized state from the polarizer 61, and reflects the first-color light Lb in the second polarized state from the first reflective liquid crystal panel 31 to the synthetic optical system 40.

The polarizer 63 transmits the second color light Lg in the first polarized state reflected by the second reflecting member 14. The second-color light Lg in the first polarized state that has passed through the polarizer 63 passes through the polarizer 64 and is incident on the second reflective liquid crystal panel 32. The second reflective liquid crystal panel 32 photomodulates the second color light Lg transmitted through the polarizing element 63 and the polarizing element 64 based on the image data. The polarizing element 64 is arranged in the optical path of the second color light Lg between the polarizing element 63 and the second reflective liquid crystal panel 32. The polarizer 64 transmits the second-color light Lg in the first polarized state from the polarizer 63, and reflects the second-color light Lg in the second polarized state from the second reflective liquid crystal panel 32 to the synthetic optical system 40.

The polarizer 65 transmits the third color light Lr in the first polarized state reflected by the third reflecting member 15. The third-color light Lr in the first polarized state that has passed through the polarizer 65 passes through the polarizer 66 and is incident on the third reflective liquid crystal panel 33. The third reflective liquid crystal panel 33 photomodulates the third color light Lr transmitted through the polarizer 65 and the polarizer 66 based on the image data. The polarizing element 66 is arranged in the optical path of the third color light Lr between the polarizing element 65 and the third reflective liquid crystal panel 33. The polarizer 66 transmits the third color light Lr in the first polarized state from the polarizer 65, and reflects the third color light Lr in the second polarized state from the third reflective liquid crystal panel 33 to the synthetic optical system 40.

The transmissive polarizer 67 is arranged in the optical path of the first color light Lb between the polarizer 62 and the synthetic optical system 40. The transmissive polarizing element 67 transmits the first color light Lb in the second polarized state among the first color light Lb emitted from the polarizer 62 to the synthetic optical system 40, and is an unnecessary first color light Lb in the first polarized state. Prevents transmission.

The transmissive polarizer 68 is arranged in the optical path of the second color light Lg between the polarizer 64 and the synthetic optical system 40. The transmission type polarizer 68 transmits the second color light Lg in the second polarized state out of the second color light Lg emitted from the polarizer 64 to the synthetic optical system 40, and the unnecessary second color light Lg in the first polarized state. Prevents transmission.

A transmissive polarizer 69 is arranged in the optical path of the third color light Lr between the polarizer 66 and the synthetic optical system 40. The transmissive polarizing element 69 transmits the third color light Lr in the second polarized state among the third color light Lr emitted from the polarizer 66 to the synthetic optical system 40, and is an unnecessary third color light Lr in the first polarized state. Prevents transmission.

The first polarized state is, for example, a P-polarized state. The second polarized state is, for example, the S polarized state.

The synthetic optical system 40 includes a first color light Lb light-modulated by the first reflective liquid crystal panel 31, a second color light Lg light-modulated by the second reflective liquid crystal panel 32, and a third reflective liquid crystal panel 33. Combined with the light-modulated third-color light Lr, synthetic light is generated. In the present embodiment, the synthetic optical system 40 includes a cross dichroic prism. In the synthetic optical system 40, the first incident surface 41 on which the first color light Lb light-modulated by the first reflective liquid crystal panel 31 is incident and the second color light Lg light-modulated by the second reflective liquid crystal panel 32 are incident. It has a second incident surface 42, a third incident surface 43 on which the third color light Lr light-modulated by the third reflective liquid crystal panel 33 is incident, and an ejection surface 46 that emits synthetic light.

The first incident surface 41 is parallel to the YZ plane and faces the −X direction. The second incident surface 42 is parallel to the XZ plane and faces the −Y direction. The third entrance surface 43 is parallel to the YZ plane and faces the + X direction. The injection surface 46 is parallel to the XZ plane and faces the + Y direction.

The composite optical system 40 is incident from the first composite surface 44, which synthesizes the first color light Lb incident from the first incident surface 41 and the second color light Lg incident from the second incident surface 42, and the second incident surface 42. It has a second composite surface 45 that combines the second color light Lg and the third color light Lr incident from the third incident surface 43. The first composite surface 44 and the second composite surface 45 are parallel to the Z axis. The first composite surface 44 and the second composite surface 45 are orthogonal to each other.

The first composite surface 44 is ejected from the first reflective liquid crystal panel 31 and reflects the first color light Lb incident from the first incident surface 41 via the polarizer 62. The first composite surface 44 is ejected from the second reflective liquid crystal panel 32, and transmits the second color light Lg incident from the second incident surface 42 via the polarizer 64.

The second composite surface 45 is ejected from the second reflective liquid crystal panel 32 and transmits the second color light Lg incident from the second incident surface 42 via the polarizer 64. The second composite surface 45 is ejected from the third reflective liquid crystal panel 33, and reflects the third color light Lr incident from the third incident surface 43 via the polarizer 66.

The projection optical system 50 projects the synthetic light generated by the synthetic optical system 40 and emitted from the injection surface 46 onto the screen 70 which is the projection surface.

FIG. 3 is a diagram schematically showing a part of the projection type display device 100 according to the present embodiment. FIG. 3 shows a polarizing element 63 and a polarizing element 64 arranged in an optical path of the second color light Lg between the second reflective liquid crystal panel 32, the second reflective liquid crystal panel 32 and the second reflective member 14, and polarized light. It is a figure which shows typically the transmission type polarizing element 68 arranged in the optical path of the 2nd color light Lg between a child 64 and a synthetic optical system 40.

As shown in FIGS. 2 and 3, the second reflective liquid crystal panel 32 is arranged in the + Z direction with respect to the synthetic optical system 40. The polarizer 64 is arranged on the −Y side of the synthetic optical system 40, and is arranged on the −Z side of the second reflective liquid crystal panel 32. The polarizer 63 is arranged on the −Z side of the polarizer 64.

The second reflective liquid crystal panel 32 has a transparent substrate 34 having a transparent electrode, an active matrix substrate 35 having a reflective electrode, and a liquid crystal layer 36 provided between the transparent substrate 34 and the active matrix substrate 35. An alignment film 37 is provided on the surface of the transparent substrate 34 facing the liquid crystal layer 36. The alignment film 37 is provided on the surface of the active matrix substrate 35 facing the liquid crystal layer 36.

The reflective electrodes are arranged in a matrix for each pixel on the active matrix substrate 35. The transparent substrate 34 and the active matrix substrate 35 are arranged so that the transparent electrode and the reflective electrode face each other. The outer surface of the transparent substrate 34 includes an incident surface 32A. The liquid crystal layer 36 includes a nematic liquid crystal arranged between the transparent electrode and the reflective electrode. Nematic liquid crystals are negatively dielectric anisotropy. The nematic liquid crystal is provided between the transparent substrate 34 and the active matrix substrate 35 in a state where the pretilt angle is given.

The polarizer 63 is a wire grid type polarizer. The polarizer 63 transmits the second color light Lg in the first polarized state reflected by the second reflecting member 14. The second color light Lg transmitted through the polarizer 63 is incident on the second reflective liquid crystal panel 32 via the polarizer 64. The second reflective liquid crystal panel 32 photomodulates the second color light Lg from the polarizer 64 based on the image data. In the present embodiment, the polarization conversion element 7 incidents the second color light Lg in the first polarization state on the polarizer 63. The polarizer 63 transmits the second color light Lg in the first polarized state from the second reflecting member 14.

The polarizer 64 is a wire grid type polarizer. The polarizing element 64 is arranged in the optical path of the second color light Lg between the polarizing element 63 and the second reflective liquid crystal panel 32. The polarizer 64 transmits the second color light Lg in the first polarized state, which is emitted from the polarizer 63 and incident on the second reflective liquid crystal panel 32. The second color light Lg transmitted through the polarizer 64 is incident on the incident surface 32A of the transparent substrate 34 of the second reflective liquid crystal panel 32. The second color light Lg incident on the incident surface 32A is incident on the liquid crystal layer 36 via the transparent substrate 34, passes through the liquid crystal layer 36, and is reflected by the reflective electrode of the active matrix substrate 35. The second color light Lg reflected by the reflective electrode of the active matrix substrate 35 passes through the liquid crystal layer 36 again, and then is emitted from the transparent substrate 34 of the second reflective liquid crystal panel 32. The second color light Lg in the second polarized state is emitted from the second reflective liquid crystal panel 32. The second-color light Lg in the second polarized state emitted from the second reflective liquid crystal panel 32 is incident on the polarizer 64.

The polarizer 64 has an incident surface 64A on which the second color light Lg from the polarizer 63 is incident, and a reflecting surface 64B that reflects the second color light Lg from the second reflective liquid crystal panel 32. The polarizer 64 is inclined with respect to the optical path of the second color light Lg incident on the second reflective liquid crystal panel 32. The incident surface 64A of the polarizer 64 and the optical path of the second color light Lg incident on the incident surface 64A of the polarizer 64 intersect at an angle of 45 [°]. The second color light Lg reflected by the second reflective liquid crystal panel 32 travels in the −Z direction. The light path of the second color light Lg incident on the reflecting surface 64B of the polarizer 64 and the reflecting surface 64B of the polarizer 64 intersect at an angle of 45 [°].

The polarizer 64 reflects the second color light Lg in the second polarized state from the second reflective liquid crystal panel 32 in the + Y direction. The second-color light Lg in the second polarized state emitted from the second reflective liquid crystal panel 32 is reflected by the polarizer 64, travels in the + Y direction, and is incident on the synthetic optical system 40. The transmissive polarizing element 68 removes unnecessary second color light Lg in the first polarized state from the second color light Lg incident on the synthetic optical system 40 from the polarizer 64, and the second color light Lg in the second polarized state is generated. It is incident on the synthetic optical system 40.

As described above, the operations of the second reflective liquid crystal panel 32, the polarizer 63, the polarizer 64, the transmissive polarizer 68, and the synthetic optical system 40 have been described with reference to FIG. Like the polarizer 64, the polarizer 62 has an incident surface 62A and a reflecting surface 62B, and the polarizer 66 has an incident surface 66A and a reflecting surface 66B. The action of the first reflective liquid crystal panel 31, the polarizer 61, the polarizer 62, the transmissive polarizing element 67, and the synthetic optical system 40, and the third reflective liquid crystal panel 33, the polarizer 65, the polarizer 66, and the transmissive polarized light. The actions of the child 69 and the synthetic optical system 40 are the same as those of the second reflective liquid crystal panel 32, the polarizer 63, the polarizer 64, the transmissive polarizing element 68, and the synthetic optical system 40. Omit.

Next, the reflective liquid crystal panel according to the present embodiment will be described. FIG. 4 is a cross-sectional view showing an example of the second reflective liquid crystal panel 32 according to the present embodiment. The structure of the first reflective liquid crystal panel 31 and the structure of the third reflective liquid crystal panel 33 are the same as the structure of the second reflective liquid crystal panel 32.

As shown in FIG. 4, the second reflective liquid crystal panel 32 includes a plurality of transparent substrates 34, an active matrix substrate 35 facing the transparent substrate 34, and a plurality of arrangements arranged between the transparent substrate 34 and the active matrix substrate 35. The liquid crystal layer 36 including the liquid crystal 36A is provided.

The transparent substrate 34 has a glass substrate 34A and a transparent electrode 38 formed on the surface of the glass substrate 34A facing the active matrix substrate 35. The transparent electrode 38 is formed over the entire surface of the glass substrate 34A. The transparent electrode 38 is formed of a transparent conductive material such as ITO (Indium Tin Oxide). A potential common to all the plurality of pixels is applied to the transparent electrode 38.

The active matrix substrate 35 is connected to a silicon substrate 35A, a switching element such as a TFT (Thin Film Transistor) provided for each of a plurality of pixels on the surface of the silicon substrate 35A, and a switching element, and is provided for each of the plurality of pixels. It has a reflective electrode 39. A plurality of reflective electrodes 39 are arranged in a matrix on the surface of the silicon substrate 35A. The reflective electrode 39 is made of a metal material such as aluminum (Al) which has a high reflectance in the visible region.

The reflective electrode 39 and the pixel have a one-to-one correspondence. In the present embodiment, the reflective electrode 39 has a square shape. The pixels are also square.

An alignment film 37 that covers the transparent electrode 38 is formed on the transparent substrate 34. An alignment film 37 that covers the reflective electrode 39 is formed on the active matrix substrate 35. The alignment film 37 orients the liquid crystal 36A of the liquid crystal layer 36 in a predetermined orientation direction. The alignment film 37 may be an oblique vapor deposition film formed of an inorganic material such as silicon dioxide (SiO ₂ ), or a polymer film such as polyimide having a surface subjected to a rubbing treatment.

In the present embodiment, the liquid crystal 36A of the liquid crystal layer 36 is a nematic liquid crystal having a negative dielectric anisotropy. Dielectric anisotropy refers to the difference between the permittivity parallel to the long axis of the liquid crystal and the permittivity perpendicular to the long axis. Negative dielectric anisotropy refers to a state in which the difference between the permittivity parallel to the long axis of the liquid crystal and the permittivity perpendicular to the long axis becomes negative.

The liquid crystal 36A of the liquid crystal layer 36 is vertically aligned by the alignment film 37. That is, in the present embodiment, the liquid crystal 36A is a vertically oriented liquid crystal.

When the voltage between the transparent electrode 38 and the reflecting electrode 39 is zero, the liquid crystal 36A is oriented substantially perpendicular to the surface of the silicon substrate 35A. That is, in the present embodiment, the second reflective liquid crystal panel 32 displays black in the normal black display mode. When a voltage is applied between the transparent electrode 38 and the reflective electrode 39, the liquid crystal 36A tilts in a predetermined orientation direction and changes the light transmittance.

5 and 6 are diagrams schematically showing the liquid crystal 36A according to the present embodiment. As shown in FIG. 5, the liquid crystal 36A is provided with a pretilt angle θ. The pretilt angle θ refers to the angle formed by the surface of the active matrix substrate 35 on which the reflective electrode 39 is formed and the long axis of the liquid crystal 36A. The liquid crystal 36A is vertically oriented with a pretilt angle θ.

As shown in FIGS. 5 and 6, the liquid crystal 36A is pre-tilted in a predetermined orientation direction H. In the present embodiment, the pretilt angle θ is 85 [°] or more and 89 [°] or less. In the present embodiment, the orientation direction H of the liquid crystal 36A is a direction parallel to the diagonal line of the square reflective electrode 39. That is, the orientation direction H of the liquid crystal 36A is set to the direction of 45 [°] with respect to one side of the square reflective electrode 39. The orientation direction H of the liquid crystal 36A may be 42 [°] or more and 48 [°] or less with respect to one side of the square reflective electrode 39.

FIG. 7 is a perspective view schematically showing the relationship between the orientation direction H of the liquid crystal 36A of the second reflective liquid crystal panel 32 according to the present embodiment, the polarizer 64, and the synthetic optical system 40. As shown in FIG. 7, the local coordinate system (XaYaZa coordinate system) is defined in the second reflective liquid crystal panel 32. The Xa axis and the Ya axis are defined on the surface of the active matrix substrate 35 of the second reflective liquid crystal panel 32. The Xa axis and the Ya axis are orthogonal to each other. The Za axis is orthogonal to the surface of the active matrix substrate 35. In FIG. 7, the X-axis of the XYZ Cartesian coordinate system and the Xa-axis of the local coordinate system are parallel. Similarly, the Y-axis and the Ya-axis are parallel, and the Z-axis and the Za-axis are parallel. The + Xa direction of the local coordinate system corresponds to the + X direction of the XYZ Cartesian coordinate system. The + Ya direction of the local coordinate system corresponds to the −Y direction of the XYZ Cartesian coordinate system. The + Za direction of the local coordinate system corresponds to the -Z direction of the XYZ Cartesian coordinate system. As shown in FIG. 7, the orientation direction H of the liquid crystal 36A is parallel to the diagonal line of the pixels of the second reflective liquid crystal panel 32, and is determined in the direction approaching the synthetic optical system 40. As described above, the pixel and the reflecting electrode 39 have a one-to-one correspondence, and the pixel and the reflecting electrode 39 have a square shape, respectively.

FIG. 7 shows a state in which the liquid crystal 36A is provided with the pretilt angle θ. In the present embodiment, the polarizer 64 is a wire grid type polarizer composed of a plurality of fine slits. The extending direction of the slit of the wire grid WG of the wire grid type polarizer is the X-axis direction (Xa-axis direction). That is, the slit of the wire grid WG and the X-axis (Xa-axis) are parallel.

In the present embodiment, the orientation direction H of the liquid crystal 36A is set to be parallel to the diagonal line of the pixels of the second reflective liquid crystal panel 32 and to approach the synthetic optical system 40. In other words, when the projected line segment RL in which the long axis of the liquid crystal 36A is projected on the active matrix substrate 35 and the reference line in which the extending direction of the slit of the wire grid WG is projected perpendicularly to the active matrix substrate 35 are defined. The projected line segment RL has an angle of α [°] with respect to the reference line, and one end of the projected line segment RL corresponding to the end of the liquid crystal 36A that is separated from the active matrix substrate 35 It is arranged at a position farther from the other end of the projected line segment RL from the intersection of the plane including the reflecting surface 64B of the polarizer 64 and the plane including the surface of the active matrix substrate 35. In this embodiment, α [°] is 45 [°]. The reference line is parallel to the X-axis and the Xa-axis.

In the present embodiment, the orientation direction H of the liquid crystal 36A is set to be parallel to the diagonal line of the pixels of the second reflective liquid crystal panel 32 and to approach the synthetic optical system 40, so that the screen is a projection surface. At 70, a high-contrast image can be obtained.

FIG. 8 is a diagram showing the vectors RLa and RLb of the projected line segment RL in the XaYa plane for the liquid crystal alignment conditions according to the present embodiment. The vectors RLa and RLb of the projected line segment RL indicate the orientation direction of the liquid crystal 36A from which a high-contrast image can be obtained. When the angle φ of the vectors RLa and RLb counterclockwise from the Xa axis is defined with reference to the Xa axis, the angle φ of the vector RLa is 225 [°] and the angle φ of the vector RLb is 315 [°]. ].

That is, when the reflective electrode 39, which is a pixel electrode, has a square shape and the sides of the reflective electrode 39 are parallel to the Xa axis and the Ya axis, the vectors RLa and RLb indicating the orientation direction H of the liquid crystal 36A are the reflective electrodes 39. It is parallel to the diagonal line.

The vector RLa indicating the orientation direction H of the liquid crystal 36A and the vector RLb indicating the orientation direction H of the liquid crystal 36A are orthogonal to each other. When the reference line LT2 orthogonal to the second incident surface 42 of the synthetic optical system 40 is used as a reference, the vector RLa is parallel to the diagonal line of the pixel (reflection electrode 39) and is one side (-Xa) with respect to the reference line LT2. It is determined to approach the synthetic optical system 40 toward the first direction of the side). The vector RLb is parallel to the diagonal line of the pixel (reflection electrode 39), and is determined to approach the composite optical system 40 in the second direction on the other side (+ Xa side) with respect to the reference line LT2. The first direction and the second direction are orthogonal to each other.

Next, the operation of the projection type display device 100 according to the present embodiment will be described. FIG. 9 is a plan view for explaining the operation of the projection type display device 100 according to the present embodiment. FIG. 10 is a perspective view for explaining the operation of the projection type display device 100 according to the present embodiment.

In the present embodiment, when the light emitted from the light source device 1 has a bias in the intensity distribution, it is formed on the image plane side of the projection optical system 50 by a plurality of optical components arranged in the optical path of the first color light Lb. The bias of the light intensity distribution to be formed, the bias of the light intensity distribution formed on the image plane side of the projection optical system 50 by the plurality of optical components arranged in the optical path of the second color light Lg, and the optical path of the third color light Lr. The optical system of the projection type display device 100 including the illumination optical system 10 is constructed so that the bias of the light intensity distribution formed on the image plane side of the projection optical system 50 by the plurality of arranged optical components matches. ing.

In the following description, an optical system composed of a plurality of optical components arranged in the optical path of the first color light Lb is appropriately referred to as a first color optical optical system 81, and is arranged in the optical path of the second color light Lg. An optical system composed of a plurality of optical components is appropriately referred to as a second color optical optical system 82, and an optical system composed of a plurality of optical components arranged in the optical path of the third color optical Lr is appropriately referred to as a third color optical system. It is referred to as a color optical optical system 83.

The first color optical optical system 81 includes a first color separating element 11, a fourth reflecting member 16, a first reflecting member 13, a relay optical system 20, a polarizing element 61, a polarizing element 62, and a first reflecting type. Includes a liquid crystal panel 31.

The second color optical optical system 82 includes a first color separating element 11, a second color separating element 12, a second reflecting member 14, a polarizing element 63, a polarizing element 64, and a second reflective liquid crystal panel 32. Including.

The third color optical optical system 83 includes a first color separating element 11, a second color separating element 12, a third reflecting member 15, a polarizing element 65, a polarizing element 66, and a third reflective liquid crystal panel 33. Including.

In the present embodiment, the bias of the light intensity distribution of the light source device 1 formed on the emission surface 46 side of the synthetic optical system 40 by the first color optical optical system 81 and the emission of the synthetic optical system 40 by the second color optical optical system 82. The bias of the light intensity distribution of the light source device 1 formed on the surface 46 side and the bias of the light intensity distribution of the light source device 1 formed on the injection surface 46 side of the synthetic optical system 40 by the third color optical optical system 83. Match.

The operation of the first color optical optical system 81 will be described. The light emitted from the light source device 1, uniformized in the plane perpendicular to the optical axis of the integrator optical system 6 in the integrator optical system 6, and passed through the condenser lens 8 is the first color light Lb in the first color separating element 11. And the light Lgr having a wavelength different from that of the first color light Lb. The first color light Lb is reflected by the first color separating element 11 in the XY plane. In the first color separating element 11, the first reflection of the first color light Lb is performed.

As shown in FIG. 9, the condenser lens 8 and the first condensing lens 21 of the relay optical system 20 condense the first color light Lb on the reflecting surface 16A of the fourth reflecting member 16. In the first color optical optical system 81, the first intermediate image of the light source image is formed on the reflecting surface 16A of the fourth reflecting member 16. That is, the first imaging point in the first color optical optical system 81 is formed on the reflecting surface 16A of the fourth reflecting member 16.

The first color light Lb reflected by the first color separating element 11 is incident on the fourth reflecting member 16. The first color light Lb is reflected by the fourth reflecting member 16 in the XY plane. The fourth reflecting member 16 reflects the first color light Lb for the second time.

The first color light Lb reflected by the fourth reflecting member 16 is incident on the first reflecting member 13. The first color light Lb is reflected by the first reflecting member 13 in the YZ plane. The first reflection member 13 reflects the first color light Lb for the third time.

The first color light Lb reflected by the first reflecting member 13 passes through the polarizing element 61 and the polarizing element 62 and is incident on the first reflecting type liquid crystal panel 31. The first color light Lb is reflected by the first reflective liquid crystal panel 31 in the −Z direction. In the first reflective liquid crystal panel 31, the fourth reflection of the first color light Lb is performed.

As shown in FIG. 9, the second condensing lens 22 and the third condensing lens 23 of the relay optical system 20 condense the first color light Lb on the incident surface 31A of the first reflective liquid crystal panel 31. The first lens array 6A and the incident surface 31A of the first reflective liquid crystal panel 31 are optically conjugated.

The first color light Lb reflected by the first reflective liquid crystal panel 31 is incident on the polarizer 62. The first color light Lb is reflected by the polarizer 62 in the XZ plane. The polarizer 62 performs the fifth reflection of the first color light Lb.

The first color light Lb reflected by the polarizer 62 is incident on the first incident surface 41 of the synthetic optical system 40.

As described above, the first color light Lb is reflected five times by the plurality of optical components in the first color optical optical system 81 and is incident on the synthetic optical system 40.

A mirror image of the image is formed by reflection by the optical components. A mirror image is an image of an object created by the reflection of a plane mirror. In other words, the mirror image means an image in which only the left and right or the top and bottom are reversed, and the object and the mirror image have a plane-symmetrical relationship.

Further, the first color light Lb is focused twice by the relay optical system 20. That is, the first color light Lb is imaged twice in the first color optical optical system 81 and is incident on the synthetic optical system 40. An inverted image of the image is formed by the relay optical system 20. The inverted image refers to an image of an object created through a convex lens or the like, and the image of the object and the inverted image have a 180 [°] rotational symmetry with respect to the optical axis.

Next, the operation of the second color optical optical system 82 will be described. The light emitted from the light source device 1, homogenized in the integrator optical system 6 in the plane perpendicular to the optical axis of the integrator optical system 6, and passed through the condenser lens 8 is the first color light in the first color separating element 11. It is separated into Lb and light Lgr having a wavelength different from that of the first color light Lb. The light Lgr transmitted through the first color separating element 11 is separated into the second color light Lg and the third color light Lr in the second color separating element 12. The second color light Lg is reflected by the second color separating element 12 in the XY plane. In the second color separating element 12, the first reflection of the second color light Lg is performed.

The second color light Lg reflected by the second color separating element 12 is incident on the second reflecting member 14. The second color light Lg is reflected by the second reflecting member 14 in the XZ plane. The second reflection member 14 reflects the second color light Lg for the second time.

The second color light Lg reflected by the second reflecting member 14 passes through the polarizing element 63 and the polarizing element 64 and is incident on the second reflecting type liquid crystal panel 32. The second color light Lg is reflected by the second reflective liquid crystal panel 32 in the −Z direction. In the second reflective liquid crystal panel 32, the third reflection of the second color light Lg is performed.

As shown in FIG. 9, the condenser lens 8 collects the second color light Lg on the incident surface 32A of the second reflective liquid crystal panel 32. The first lens array 6A and the incident surface 32A of the second reflective liquid crystal panel 32 are optically conjugated.

The second color light Lg reflected by the second reflective liquid crystal panel 32 is incident on the polarizer 64. The second color light Lg is reflected by the polarizer 64 in the YZ plane. The polarizer 64 performs the fourth reflection of the second color light Lg.

The second color light Lg reflected by the polarizer 64 is incident on the second incident surface 42 of the synthetic optical system 40.

As described above, the second color light Lg is reflected four times by the plurality of optical components in the second color optical optical system 82 and is incident on the synthetic optical system 40. Further, the second color light Lg is imaged once in the second color optical optical system 82 and incident on the synthetic optical system 40.

Next, the operation of the third color optical optical system 83 will be described. The light Lgr emitted from the light source device 1, uniformized in the plane perpendicular to the optical axis of the integrator optical system 6 in the integrator optical system 6, and passed through the condenser lens 8 and the first color separation element 11 is separated into the second color. In the element 12, the second color light Lg and the third color light Lr are separated. The third color light Lr passes through the second color separating element 12.

The third color light Lr transmitted through the second color separating element 12 is incident on the third reflecting member 15. The third color light Lr is reflected by the third reflecting member 15 in the YZ plane. The third reflection member 15 performs the first reflection of the third color light Lr.

The third color light Lr reflected by the third reflecting member 15 passes through the polarizing element 65 and the polarizing element 66 and is incident on the third reflecting type liquid crystal panel 33. The third color light Lr is reflected by the third reflective liquid crystal panel 33 in the −Z direction. The third reflection type liquid crystal panel 33 performs the second reflection of the third color light Lr.

As shown in FIG. 9, the condenser lens 8 collects the third color light Lr on the incident surface 33A of the third reflective liquid crystal panel 33. The first lens array 6A and the incident surface 33A of the third reflective liquid crystal panel 33 are optically conjugated.

The third color light Lr reflected by the third reflective liquid crystal panel 33 is incident on the polarizer 66. The third color light Lr is reflected by the polarizer 66 in the XZ plane. In the polarizer 66, the third reflection of the third color light Lr is performed.

The third color light Lr reflected by the polarizer 66 is incident on the third incident surface 43 of the synthetic optical system 40.

As described above, the third color light Lr is reflected three times by the plurality of optical components in the third color optical optical system 83 and is incident on the synthetic optical system 40. Further, the third color light Lr is imaged once in the third color optical optical system 83 and incident on the synthetic optical system 40.

Next, changes in the bias of the light intensity distribution of the light source device 1 in each of the first color optical optical system 81, the second color optical optical system 82, and the third color optical optical system 83 will be described with reference to FIG. In the explanation using FIG. 10, in order to make it easy to understand the bias of the light intensity distribution, the direction (direction) of the light source image showing the bias of the light intensity distribution is made to correspond to the graphical direction of the letter "F". Shown. In FIG. 10, the letter "F" is schematically drawn on each optical component, but the light source image, to be exact, each image of each microlens of the first lens array 6A has a corresponding conjugate surface. Only in the image. That is, the light source image is the third condensing lens 23, the first reflective liquid crystal panel 31, the second reflective liquid crystal panel 32, and the third reflective liquid crystal, which are optically coupled to the first lens array 6A. An image is formed on each of the panels 33. In the XZ plane, the + Z direction is above "F", and the direction of the light source image in which "F" can be read in the correct direction when viewed from the direction from the light source device 1 toward the screen 70 in the optical axis direction is set as the reference direction. ..

The direction of the light source image showing the bias of the light intensity distribution in the first color optical optical system 81 will be described. A mirror image of the light source image is formed by the reflection in the first color separating element 11. Further, the light source image is inverted by the action of the first condensing lens 21 of the relay optical system 20. As a result, as shown in FIG. 10, the direction of the light source image on the reflecting surface 16A of the fourth reflecting member 16 is the direction rotated by 180 [°] (inverted direction).

A mirror image of the light source image is formed by the reflection in the fourth reflecting member 16. Further, the direction of the light source image is reversed by the action of the second condensing lens 22 and the third condensing lens 23 of the relay optical system 20. As a result, as shown in FIG. 10, the direction of the light source image on the reflection surface 13A of the first reflection member 13 becomes a reference direction that does not reverse or rotate.

A mirror image of the light source image is formed by the reflection in the first reflecting member 13. As a result, as shown in FIG. 10, the direction of the light source image on the incident surface 31A of the first reflective liquid crystal panel 31 is upside down.

A mirror image of the light source image is formed by the reflection of the first reflective liquid crystal panel 31. As a result, as shown in FIG. 10, the direction of the light source image on the reflecting surface of the polarizer 62 is the direction rotated by 180 [°] (inverted direction).

The reflection on the polarizer 62 forms a mirror image of the light source image. As a result, as shown in FIG. 10, the direction of the light source image is upside down on the first incident surface 41 of the synthetic optical system 40.

Next, the orientation of the light source image showing the bias of the light intensity distribution in the second color optical optical system 82 will be described. A mirror image of the light source image is formed by the reflection in the second color separating element 12. As a result, as shown in FIG. 10, the direction of the light source image on the reflecting surface 14A of the second reflecting member 14 is the direction rotated by 180 [°] (inverted direction).

A mirror image of the light source image is formed by the reflection in the second reflecting member 14. As a result, as shown in FIG. 10, the direction of the light source image is upside down on the incident surface 32A of the second reflective liquid crystal panel 32.

A mirror image of the light source image is formed by the reflection of the second reflective liquid crystal panel 32. Further, the light source image is inverted by the action of the condenser lens 8. As a result, as shown in FIG. 10, the direction of the light source image is upside down on the reflecting surface of the polarizer 64.

The reflection on the polarizer 64 forms a mirror image of the light source image. As a result, as shown in FIG. 10, the direction of the light source image on the second incident surface 42 of the synthetic optical system 40 becomes a reference direction that does not invert and rotate.

Next, the orientation of the light source image showing the bias of the light intensity distribution in the third color optical optical system 83 will be described. A mirror image of the light source image is formed by the reflection in the third reflecting member 15. As a result, as shown in FIG. 10, the direction of the light source image on the incident surface 33A of the third reflective liquid crystal panel 33 is upside down.

A mirror image of the light source image is formed by the reflection of the third reflective liquid crystal panel 33. Further, the light source image is inverted by the action of the condenser lens 8. As a result, as shown in FIG. 10, the direction of the light source image on the reflecting surface of the polarizer 66 becomes a reference direction that does not invert and rotate.

The reflection on the polarizer 66 forms a mirror image of the light source image. As a result, as shown in FIG. 10, the direction of the light source image is upside down on the third incident surface 43 of the synthetic optical system 40.

The light source image formed on the first incident surface 41 and the light source image formed on the second incident surface 42 are combined on the first composite surface 44 of the composite optical system 40. As shown in FIG. 10, the light source image formed on the first incident surface 41 and the light source image formed on the second incident surface 42 match on the first composite surface 44 of the composite optical system 40.

The light source image formed on the second incident surface 42 and the light source image formed on the third incident surface 43 are combined on the second composite surface 45 of the composite optical system 40. As shown in FIG. 10, the light source image formed on the second incident surface 42 and the light source image formed on the third incident surface 43 match on the second composite surface 45 of the composite optical system 40.

Therefore, the orientation of the light source image formed on the emission surface 46 side of the synthetic optical system 40 by the first color optical optical system 81 and the light source image formed on the emission surface 46 side of the synthetic optical system 40 by the second color optical optical system 82. The direction of the light source image formed on the emission surface 46 side of the synthetic optical system 40 by the third color optical optical system 83 coincides with the direction of.

That is, in the present embodiment, as shown in FIG. 10, the direction of the light source image incident on the first incident surface 41 and the direction of the light source image incident on the second incident surface 42 are relative to the first composite surface 44. It is mirror-symmetrical, and the direction of the light source image incident on the second incident surface 42 and the direction of the light source image incident on the third incident surface 43 are mirror-symmetrical with respect to the second composite surface 45. Relationship between the orientation of the light source image incident on the first incident surface 41 of the synthetic optical system 40, the orientation of the light source image incident on the second incident surface 42, and the orientation of the light source image incident on the third incident surface 43. Therefore, the directions of the light source images of the colored light of each color emitted from the synthetic optical system 40 match.

Next, the orientation direction H of the liquid crystal 36A according to the present embodiment will be described. FIG. 11 shows the orientation direction H1 of the liquid crystal 36A of the first reflective liquid crystal panel 31 according to the present embodiment, the orientation direction H2 of the liquid crystal 36A of the second reflective liquid crystal panel 32, and the liquid crystal of the third reflective liquid crystal panel 33. It is a figure which shows typically the relationship with the orientation direction H3 of 36A.

As shown in FIG. 11, a polarizing element 62 that reflects the first color light Lb from the first reflective liquid crystal panel 31 to the first incident surface 41 of the synthetic optical system 40, and a second reflector 62 from the second reflective liquid crystal panel 32. A polarizer 64 that reflects colored light Lg on the second incident surface 42 of the synthetic optical system 40, and a polarizer that reflects the third color light Lr from the third reflective liquid crystal panel 33 on the third incident surface 43 of the synthetic optical system 40. 66 and are provided.

The first color light Lb incident on the first incident surface 41 of the composite optical system 40 is reflected by the first composite surface 44. The second color light Lg incident on the second incident surface 42 of the synthetic optical system 40 passes through the first composite surface 44 and is combined with the first color light Lb.

The third color light Lr incident on the third incident surface 43 of the composite optical system 40 is reflected by the second composite surface 45. The second color light Lg incident on the second incident surface 42 of the synthetic optical system 40 passes through the second composite surface 45 and is combined with the third color light Lr.

When the reference line LT1 orthogonal to the first incident surface 41 of the synthetic optical system 40 is defined in the first reflective liquid crystal panel 31, the orientation direction H1 of the liquid crystal 36A of the first reflective liquid crystal panel 31 is the first reflective liquid crystal. It is parallel to the diagonal line of the pixel (reflection electrode 39) of the panel 31, and is determined to approach the first incident surface 41 of the synthetic optical system 40 toward one side (+ Y side) with respect to the reference line LT1. When the local coordinate system (XaYaZa coordinate system) is defined in the first reflective liquid crystal panel 31, the reference line LT1 is parallel to the Ya axis. The orientation direction H1 of the liquid crystal 36A of the first reflective liquid crystal panel 31 is parallel to the diagonal line of the pixels (reflective electrode 39) of the first reflective liquid crystal panel 31, and is one side (-Xa side) with respect to the reference line LT1. It is determined to approach the composite optical system 40 toward the first direction of the above.

When the reference line LT2 orthogonal to the second incident surface 42 of the synthetic optical system 40 is defined in the second reflective liquid crystal panel 32, the orientation direction H2 of the liquid crystal 36A of the second reflective liquid crystal panel 32 is the second reflective liquid crystal. It is parallel to the diagonal line of the pixel (reflection electrode 39) of the panel 32, and is determined to approach the second incident surface 42 of the synthetic optical system 40 toward the other side (+ X side) with respect to the reference line LT2. When the local coordinate system (XaYaZa coordinate system) is defined in the second reflective liquid crystal panel 32, the reference line LT2 is parallel to the Ya axis. The orientation direction H2 of the liquid crystal 36A of the second reflective liquid crystal panel 32 is parallel to the diagonal line of the pixels (reflective electrode 39) of the second reflective liquid crystal panel 32, and is on the opposite side (+ Xa side) of the reference line LT2. It is determined to approach the synthetic optical system 40 toward the second direction.

When the reference line LT3 orthogonal to the third incident surface 43 of the synthetic optical system 40 is defined in the third reflective liquid crystal panel 33, the orientation direction H3 of the liquid crystal 36A of the third reflective liquid crystal panel 33 is the third reflective liquid crystal. It is parallel to the diagonal line of the pixels (reflecting electrode 39) of the panel 33, and is determined to approach the third incident surface 43 of the synthetic optical system 40 toward one side (−Y side) with respect to the reference line LT3. When the local coordinate system (XaYaZa coordinate system) is defined in the third reflective liquid crystal panel 33, the reference line LT3 is parallel to the Ya axis. The orientation direction H3 of the liquid crystal 36A of the third reflective liquid crystal panel 33 is parallel to the diagonal line of the pixels (reflective electrode 39) of the third reflective liquid crystal panel 33, and is one side (-Xa side) with respect to the reference line LT3. It is determined to approach the composite optical system 40 toward the first direction of the above.

That is, the orientation direction H1 of the liquid crystal 36A of the first reflective liquid crystal panel 31 corresponds to the vector RLa among the vectors RLa and RLb described with reference to FIG. The orientation direction H2 of the liquid crystal 36A of the second reflective liquid crystal panel 32 corresponds to the vector RLb among the vectors RLa and RLb described with reference to FIG. The orientation direction H3 of the liquid crystal 36A of the third reflective liquid crystal panel 33 corresponds to the vector RLa among the vectors RLa and RLb described with reference to FIG.

That is, in the present embodiment, when the first reflective liquid crystal panel 31 and the second reflective liquid crystal panel 32 are considered to be reflective liquid crystal panels having the same structure, the liquid crystal 36A of the first reflective liquid crystal panel 31 The orientation direction H1 of the liquid crystal 36A in the first reflective liquid crystal panel 31 and the liquid crystal 36A in the second reflective liquid crystal panel 32 so that the orientation direction H1 and the orientation direction H2 of the liquid crystal 36A of the second reflective liquid crystal panel 32 are orthogonal to each other. The orientation direction H2 of is defined.

Similarly, in the present embodiment, when the second reflective liquid crystal panel 32 and the third reflective liquid crystal panel 33 are considered to be reflective liquid crystal panels having the same structure, the liquid crystal 36A of the second reflective liquid crystal panel 32 The orientation direction H2 of the liquid crystal 36A in the second reflective liquid crystal panel 32 and the liquid crystal in the third reflective liquid crystal panel 33 so that the orientation direction H2 of the liquid crystal 36A and the orientation direction H3 of the liquid crystal 36A of the third reflective liquid crystal panel 33 are orthogonal to each other. The orientation direction H3 of 36A is defined.

Further, the liquid crystal 36A in the first reflective liquid crystal panel 31 is arranged so that the orientation direction H1 of the liquid crystal 36A of the first reflective liquid crystal panel 31 and the orientation direction H3 of the liquid crystal 36A of the third reflective liquid crystal panel 33 are parallel to each other. The orientation direction H1 and the orientation direction H3 of the liquid crystal 36A in the third reflective liquid crystal panel 33 are defined.

Further, in the present embodiment, as shown in FIG. 11, the incident surface 31A of the first reflective liquid crystal panel 31 on which the first color light Lb in the first polarized state is incident and the first reflective liquid crystal panel 31A from the first reflective liquid crystal panel 31A. A triangular columnar first space is formed by the reflecting surface 62B of the polarizer 62 on which the first-color light Lb in a two-polarized state is incident and the first incident surface 41 of the synthetic optical system 40.

Further, the incident surface 32A of the second reflective liquid crystal panel 32 on which the second color light Lg in the first polarized state is incident, and the polarizer on which the second color light Lg in the second polarized state from the second reflective liquid crystal panel 32 is incident. A second space having a triangular columnar shape is formed by the reflecting surface 64B of 64 and the second incident surface 42 of the synthetic optical system 40.

Further, the incident surface 33A of the third reflective liquid crystal panel 33 on which the third color light Lr in the first polarized state is incident, and the polarizer on which the third color light Lr in the second polarized state from the third reflective liquid crystal panel 33 is incident. A third space having a triangular columnar shape is formed by the reflecting surface 66B of 66 and the third incident surface 43 of the synthetic optical system 40.

The incident surface 31A of the first reflective liquid crystal panel 31, the incident surface 32A of the second reflective liquid crystal panel 32, and the incident surface 33A of the third reflective liquid crystal panel 33 face the same direction and are parallel to the XY plane. Arranged in the same plane.

The orientation direction H1 of the liquid crystal 36A of the first reflective liquid crystal panel 31 and the orientation direction H2 of the liquid crystal 36A of the second reflective liquid crystal panel 32 are mirror-symmetrical with respect to the first virtual plane including the first composite surface 44. It is in.

Further, the image data of the first reflective liquid crystal panel 31 and the image data of the second reflective liquid crystal panel 32 have a mirror-symmetrical relationship with respect to the first virtual plane including the first composite surface 44.

Further, the reflecting surface 62B of the polarizer 62 and the reflecting surface 64B of the polarizer 64 have a mirror-symmetrical relationship with respect to the first virtual plane including the first composite surface 44.

Further, the first incident surface 41 and the second incident surface 42 of the composite optical system 40 have a mirror-symmetrical relationship with respect to the first virtual plane including the first composite surface 44.

Further, the orientation direction H2 of the liquid crystal 36A of the second reflective liquid crystal panel 32 and the orientation direction H3 of the liquid crystal 36A of the third reflective liquid crystal panel 33 are mirror-symmetrical with respect to the second virtual plane including the second composite surface 45. There is a relationship of.

Further, the image data of the second reflective liquid crystal panel 32 and the image data of the third reflective liquid crystal panel 33 have a mirror-symmetrical relationship with respect to the second virtual plane including the second composite surface 45.

Further, the reflecting surface 64B of the polarizer 64 and the reflecting surface 66B of the polarizer 66 have a mirror-symmetrical relationship with respect to the second virtual plane including the second composite surface 45.

Further, the second incident surface 42 and the third incident surface 43 of the composite optical system 40 have a mirror-symmetrical relationship with respect to the second virtual plane including the second composite surface 45.

As a result, as shown in FIG. 11, in the image projected on the screen 70 via the synthetic optical system 40 and the projection optical system 50, the orientation direction H1 and the second reflective type of the liquid crystal 36A of the first reflective liquid crystal panel 31 The orientation direction H2 of the liquid crystal 36A of the liquid crystal panel 32 and the orientation direction H3 of the liquid crystal 36A of the third reflective liquid crystal panel 33 coincide with each other.

The orientation direction H1 of the liquid crystal 36A of the first reflective liquid crystal panel 31, the orientation direction H2 of the liquid crystal 36A of the second reflective liquid crystal panel 32, and the orientation direction H3 of the liquid crystal 36A of the third reflective liquid crystal panel 33 are shown in FIG. The relationship shown in 12 may be used. Also in the example shown in FIG. 12, the orientation directions H1, H2, and H3 of the liquid crystals 36A of the first, second, and third reflective liquid crystal panels 31, 32, and 33 are the first, second, and third reflective liquid crystal panels. It is parallel to the diagonal lines of the pixels of 31, 32, and 33, and is defined in the direction approaching the composite optical system 40. In the example shown in FIG. 12, the orientation direction H1 of the liquid crystal 36A of the first reflective liquid crystal panel 31 corresponds to the vector RLb among the vectors RLa and RLb described with reference to FIG. The orientation direction H2 of the liquid crystal 36A of the second reflective liquid crystal panel 32 corresponds to the vector RLa among the vectors RLa and RLb described with reference to FIG. The orientation direction H3 of the liquid crystal 36A of the third reflective liquid crystal panel 33 corresponds to the vector RLb among the vectors RLa and RLb described with reference to FIG. Also in the example shown in FIG. 12, the orientation direction H1 of the liquid crystal 36A of the first reflective liquid crystal panel 31, the orientation direction H3 of the liquid crystal 36A of the third reflective liquid crystal panel 33, and the orientation of the liquid crystal 36A of the second reflective liquid crystal panel 32. The direction H2 is orthogonal to the direction H2. In the image projected on the screen 70 via the synthetic optical system 40 and the projection optical system 50, the orientation direction H1 of the liquid crystal 36A of the first reflective liquid crystal panel 31 and the orientation direction H2 of the liquid crystal 36A of the second reflective liquid crystal panel 32. Consistent with the orientation direction H3 of the liquid crystal 36A of the third reflective liquid crystal panel 33.

As described above, according to the present embodiment, the orientation direction of the liquid crystal 36A is that of the pixels in each of the first reflective liquid crystal panel 31, the second reflective liquid crystal panel 32, and the third reflective liquid crystal panel 33. It is parallel to the diagonal line. As a result, it is possible to increase the contrast of the image projected on the screen 70 by the projection optical system 50.

Further, in the present embodiment, the first color light Lb emitted from the first reflective liquid crystal panel 31 and reflected by the polarizer 62 is incident on the synthetic optical system 40 from the first incident surface 41, and the second reflective liquid crystal panel 32 The second color light Lg emitted from and reflected by the polarizer 64 is incident on the composite optical system 40 from the second incident surface 42, the first color light Lb is reflected by the first composite surface 44, and the second color light Lg is the first composite. When transmitting through the surface 44, the orientation direction H1 of the liquid crystal 36A of the first reflective liquid crystal panel 31 and the orientation direction H2 of the liquid crystal 36A of the second reflective liquid crystal panel 32 are orthogonal to each other, so that the synthetic optical system 40 and the projection optics In the image projected on the screen 70 via the system 50, the orientation direction H1 of the liquid crystal 36A of the first reflective liquid crystal panel 31 and the orientation direction H2 of the liquid crystal 36A of the second reflective liquid crystal panel 32 coincide with each other.

Further, in the present embodiment, the third color light Lr emitted from the third reflective liquid crystal panel 33 and reflected by the polarizer 66 is incident on the synthetic optical system 40 from the third incident surface 43, and the second reflective liquid crystal panel 32 The second color light Lg emitted from and reflected by the polarizer 64 is incident on the composite optical system 40 from the second incident surface 42, the third color light Lr is reflected by the second composite surface 45, and the second color light Lg is the second composite. When transmitting through the surface 45, the orientation direction H3 of the liquid crystal 36A of the third reflective liquid crystal panel 33 and the orientation direction H2 of the liquid crystal 36A of the second reflective liquid crystal panel 32 are orthogonal to each other, so that the synthetic optical system 40 and the projection optics In the image projected on the screen 70 via the system 50, the orientation direction H3 of the liquid crystal 36A of the third reflective liquid crystal panel 33 and the orientation direction H2 of the liquid crystal 36A of the second reflective liquid crystal panel 32 coincide with each other.

As a result, deterioration of image quality due to the difference in discrimination that occurs in the plurality of reflective liquid crystal panels 31, 32, 33 is suppressed. Therefore, the projection type display device 100 according to the present embodiment can prevent deterioration of image quality due to discretion and display a high-contrast image.

1 ... light source device, 2 ... solid light source, 3 ... phosphor, 4 ... half mirror, 5 ... condensing optical system, 6 ... integrator optical system, 6A ... first lens array, 6B ... second lens array, 7 ... polarized light Conversion element, 8 ... Condenser lens, 10 ... Illumination optical system, 11 ... First color separation element, 12 ... Second color separation element, 13 ... First reflection member, 13A ... Reflection surface, 14 ... Second reflection member, 14A ... Reflective surface, 15 ... 3rd reflective member, 15A ... Reflective surface, 16 ... 4th reflective member, 16A ... Reflective surface, 20 ... Relay optical system, 21 ... 1st condensing lens, 22 ... 2nd condensing lens, 23 ... 3rd condenser lens, 31 ... 1st reflective liquid crystal panel, 31A ... incident surface, 32 ... 2nd reflective liquid crystal panel, 32A ... incident surface, 33 ... 3rd reflective liquid crystal panel, 33A ... incident surface, 34 ... transparent substrate, 35 ... active matrix substrate, 36 ... liquid crystal layer, 37 ... alignment film, 40 ... synthetic optical system, 41 ... first incident surface, 42 ... second incident surface, 43 ... third incident surface, 44 ... First composite surface, 45 ... Second composite plane, 46 ... Injection plane, 50 ... Projection optical system, 61 ... Polarizer, 62 ... Polarizer, 63 ... Polarizer, 64 ... Polarizer, 65 ... Polarizer, 66 ... 6th child, 70 ... screen, 81 ... 1st color optical optical system, 82 ... 2nd color optical optical system, 83 ... 3rd color optical optical system, 100 ... projection type display device, Lb ... 1st color light (blue light), Lg ... second color light (green light), Lr ... third color light (red light), Lgr ... light.

Claims (2)

An illumination optical system that separates the light emitted from the light source device into multiple colors to generate multiple colored lights.
A plurality of reflective liquid crystal panels arranged in each of the plurality of optical paths of the colored light and photomodulating the colored light based on image data.
A plurality of wire grid type polarizers arranged in each of the plurality of optical paths of the colored light, transmitting the colored light in the first polarized state and reflecting the colored light in the second polarized state.
A synthetic optical system that is light-modulated by the reflective liquid crystal panel and synthesizes a plurality of the colored lights reflected by the polarizer to generate synthetic light.
A projection optical system that projects the synthetic light generated by the synthetic optical system onto a projection surface,
With
The reflective liquid crystal panel has a negative dielectric anisotropy, is parallel to the diagonal of the pixel, and has a liquid crystal layer containing a liquid crystal that is pre-tilted in an orientation direction approaching the synthetic optical system and is oriented. ,
The composite optical system has a first incident surface and a second reflection surface on which first color light emitted from the first reflective liquid crystal panel among the plurality of reflective liquid crystal panels and reflected by the composite surface of the synthetic optical system is incident. It has a second incident surface, which is emitted from a mold liquid crystal panel and is incident with a second color light transmitted through the composite surface.
The polarizer is inclined with respect to a first polarizing element that transmits the first color light in the first polarized state and an optical path of the first color light that has passed through the first polarized light, and the first polarized state. A second polarizer that transmits the first color light and reflects the first color light in the second polarized state from the first reflective liquid crystal panel to the first incident surface, and the second polarized light in the first polarized state. The second reflective liquid crystal panel that transmits the third polarized light that transmits colored light and the second polarized light that is inclined with respect to the optical path of the second colored light after transmitting the third polarized light and transmits the second colored light in the first polarized state. Includes a fourth polarizing element that reflects the second color light in the second polarized state from the second incident surface to the second incident surface.
The orientation direction of the liquid crystal of the first reflective liquid crystal panel and the orientation direction of the liquid crystal of the second reflective liquid crystal panel are orthogonal to each other.
The synthetic optical system has a third incident surface on which a third color light emitted from the third reflective liquid crystal panel among the plurality of reflective liquid crystal panels and reflected by the synthetic surface of the synthetic optical system is incident.
The polarizer is inclined with respect to the optical path of the third color light, transmits the third color light in the first polarized state, and transmits the third color light in the second polarized state from the third reflective liquid crystal panel. It contains a fifth polarizer that reflects off the third incident surface.
The composite surface of the synthetic optical system includes a first composite surface that synthesizes the first color light and the second color light, and a second composite surface that synthesizes the second color light and the third color light.
The orientation direction of the liquid crystal of the first reflective liquid crystal panel, the orientation direction of the liquid crystal of the third reflective liquid crystal panel, and the orientation direction of the liquid crystal of the second reflective liquid crystal panel are orthogonal to each other.
In image projected on the screen through the composite optical system and the projection optical system, the alignment direction of the liquid crystal of the first reflective liquid crystal panel of the first color light and the light modulation and light modulating the second color light wherein the alignment direction of liquid crystal molecules in the second reflective liquid crystal panel, the orientation of the liquid crystal of the third color light and the third reflective liquid crystal panel in which the light modulating match,
Projection type display device. The incident surface of the first reflective liquid crystal panel on which the first color light in the first polarized state is incident, and the second color light incident on the first color light in the second polarized state from the first reflective liquid crystal panel. A triangular columnar first space is formed by the reflecting surface of the polarizer and the first incident surface of the synthetic optical system.
The incident surface of the second reflective liquid crystal panel on which the second color light in the first polarized state is incident, and the fourth color light incident on the second color light in the second polarized state from the second reflective liquid crystal panel. A triangular columnar second space is formed by the reflecting surface of the polarizer and the second incident surface of the synthetic optical system.
The incident surface of the third reflective liquid crystal panel on which the third color light in the first polarized state is incident, and the third color light in the second polarized state from the third reflective liquid crystal panel are incident. A triangular columnar third space is formed by the reflecting surface of the polarizer and the third incident surface of the synthetic optical system.
The incident surface of the first reflective liquid crystal panel, the incident surface of the second reflective liquid crystal panel, and the incident surface of the third reflective liquid crystal panel face in the same direction and are in the same plane parallel to a predetermined surface. Placed in
The orientation direction of the liquid crystal of the first reflective liquid crystal panel and the orientation direction of the liquid crystal of the second reflective liquid crystal panel are mirror-symmetrical with respect to the first synthetic surface, and the first reflective liquid crystal panel. The image data of the second reflector and the image data of the second reflective liquid crystal panel are mirror-symmetric, and the reflection surface of the second polarizer and the reflection surface of the fourth polarizer are mirror-symmetric, and the synthetic optical system The first incident surface and the second incident surface are mirror-symmetrical.
The orientation direction of the liquid crystal of the second reflective liquid crystal panel and the orientation direction of the liquid crystal of the third reflective liquid crystal panel are mirror-symmetrical with respect to the second composite surface, and the second reflective liquid crystal panel The image data of the third reflector and the image data of the third reflective liquid crystal panel are mirror-symmetrical, and the reflecting surface of the fourth polarizer and the reflecting surface of the fifth polarizing element are mirror-symmetric, and the synthetic optical system The second incident surface and the third incident surface are mirror-symmetrical.
The projection type display device according to claim 1.

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